Process of manufacturing opaquing agents for white enamel.



ED err gr ns r TENT op nion.

IG-NAZ KBEIDL, OF VIENNA, AUSTRIA-HUNGARY. PROCESS OF MANUFACTURING OPAQUING AGENTS FOR. WHITE ENAMEL. 1,123,760. Specification of Letters Patent Patented Jan. 5, 1915. Ho Drawing. Application filed May 29, 1912. Serial No. 700,396: To atl'whomit may concern: I larly suitable as a clouding agent in the 3 Be it known that I, Dr. Iennz KRnioL, manufacture of white enamel. partner of the firm Vereinigte Chemische In the preparation of opaque enamel the Fabriken, Landau, Kreidl, Heller it (30., of improved clouding agent is added in the co Kohlgasse 5-9, Vienna,-XXI, Austria-Hun-,. required proportions and in the usual mangary, a subjectof the Emperor of Austrianor to the already melted and ground Hungary, residing at Vienna, XXI, Kolilenamel mass. gasse 5-4), in the Empire of Austria-Hun- Having now particularly described and gary, have invented a new and useful Procascertained the nature of my invention and c5 ess of Manufacturing-Opaquing Agents for in what manner the same is to be perlVhite Enameh, of Which the following is formed, I declare that What I claim is: a specification. 1. An improved process forthe produc The invention relates to a process for tion of a clouding agent for the preparamanufacturing opaquing agents for enamtion ot'u'hife enamel consisting of a silica 7o el's. containing zirconium compound free from The presentjnvention has for its object an combined alkali, the said compound being improved process for the production of a formed by heating silicious matter with a voluminous silica containing compound 0 zirconium compound free from silicious zirconium for rendering enamel and simimatter in the presence of an alkaline agent, lar vitreous masses opaque. According to and freeing the formed silica-containing the invention this voluminous product is zirconium compound from combined alkali. obtained from a zirconium compound con- 2. Animproved process for producing a taining no silicic acid, for example zirco- -voluminous silica-containing zirconium comnium oxid (zirconia) and silicic acid or compound for cloudin enamel, comprising pounds thereof. According to the invenheating a mixture 0. silicious matter and a tion this product is formed by combining zirconium compound free from silicic acid silica or a compound thereof with a zirinthe presenceof an alkaline agent, and conium compound free from silica in the freeing the reaction product from the thus presence of an alkaline agent and removformed alkali-metal silicates and combined mg the combined alkali. alkali. a 'A suitable method for the preparation 3. An improved process for producing a f th l di g ag t t b employed in voluminous silica-containing zirconium com the preparation of White enamel according pound for clouding enamel, comprising to the present invention is given below byheating a mixture of a zirconium compound 99 Way of example. free from silicic acid and not more than an Zirconium oxid is mixed with silicic acid equal quantity of silicious matter in the in equal molecular proportionsor less an presence of an alkaline agent, and freeing the mixture heated with caustic alkali, the reaction product from the thus formed alkali carbonates or the like. \Vhen the alkali-metal silicates and combined alkali. temperature is maintained somewhat above 4. An improved process for producing a red heat, a small excess of alkali is sufvoluminous silica-containing zirconium comficient, for example a mixture in the propound for clouding enamel, comprising portions by Weight one part of zirconium heating amixture of silicicacid and a ziroxid plus silica, to one part of alkali. conium compound free from silicic acid in 100 the temperature is kept somewhat below the presence of an alkaline agent, and freered heat a great-er excess of alkali must be ing the reaction product from the formed used, the proportions by weight of zircoalkali-metal silicates and combined alkali. nium oXid plus silica to alkali being say 1:3 5. An improved process for producing a. or 1:4. voluminous silicacontaining zirconium com The reaction product is free from the pound for clouding enamel, comprising partly formed soluble silicates by treatheating a mixture of a silicic acid compound -ment with Water and the combined alkali and a zirconium compound free from silicic is removed by treatment with Whak acid. acid in the presence of an alkaline agent, no

After removal ofthe solution and drying and if necessary glovving, a voluminous silicioue product remains which is particuand freeing the reaction product from the thus formed alkali-metal silicates and combined alkali.

6. Q1; iniprovecl process forproducinga voluminous silicwcontaining zirconium compound for clouding enamel, comprising heating a mixture of zirconium oxid and sili- 5 ,cious'matber in the presence of an alkaline;

agent; and fleeing the reaction product from the thus formed combined alkali. I

7. An improved process for producing 11) voluminous silica-containing zirconium compound for clouding enamel, comprising heetmg amlxture of 's1l1c1c mud and zirzilkeli-metal silicates and DR. IGNAZ KREIDL.

Witnesses l I I Hneo Knm, AUGUST FUGGER. 

